Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9a73021b978121…

MALICIOUS

PDF

69.1 KB Created: 2021-02-25 20:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 59d23900ed0b568431f727f7d1a198cc SHA-1: fe0bf4ae788b8d893b272dd4aa938f9b383b47d3 SHA-256: 1b9a73021b97812110a9a8e5dd78a9a09372fa3813194d9465616f6c2ab99f26
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'instructions', which aligns with the observed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/123?utm_term=rain+dial+plus+instructions In PDF document text
    • http://junumidutuzakox.getenjoyment.net/xavuvimonoximefonodup.pdfIn PDF document text
    • https://dojudetokin.weebly.com/uploads/1/3/4/6/134613144/menilolefefesewag.pdfIn PDF document text
    • https://cdn.sqhk.co/rawewosit/AEichjA/cardiograph_heart_rate_meter.pdfIn PDF document text
    • http://awpmode.com/nhc_khiu_v_cha_cha_cha_khng_lih8lc8.pdfIn PDF document text
    • https://cdn.sqhk.co/nilimijano/llLjbgg/rafoteke.pdfIn PDF document text
    • http://lemoxovuv.22web.org/bsc_physics_syllabus_berhampur_university.pdfIn PDF document text
    • https://tufelonidozuwux.weebly.com/uploads/1/3/2/6/132681512/karimetatota.pdfIn PDF document text
    • http://graatorama.space/tezaditutuvogkjkf1.pdfIn PDF document text
    • http://mapepax.22web.org/82562236648.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/hhjd2jh/my_pocket_galaxy_3d_gravity_sandbox_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzudumijamo/jiujdgi/ketilolivuresugukabevi.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/how_to_program_seiki_remote.pdfIn PDF document text
    • http://viduzunopiwofik.22web.org/avermedia_tv_tuner_card_software.pdfIn PDF document text
    • http://prizinsta.site/answering_service_companies_cincinnati3x1o2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasomibaben.rf.gd/loxamelolunugukatote.pdfIn PDF document text
    • http://lexojowal.epizy.com/love_failure_songs_telugu_ringtones.pdfIn PDF document text
    • http://fisuzes.epizy.com/brocade_network_advisor_san_user_manual.pdfIn PDF document text
    • http://kibulirol.rf.gd/jowefejodasapekogedus.pdfIn PDF document text
    • http://jimogorop.rf.gd/best_cheap_roomba.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20C 5072 bytes
SHA-256: f530f9b1503303ff67b309ea8d02ddba3ed3a4e9e538d5edf874fa54ad23d974
font_01_sfnt_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 10404 bytes
SHA-256: 76e04510567b1671a844b8e48607ac1cd6cb032bb29d130051e2e0ad8b1cbe7f

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